Show error icon when selected theme is missing

Add IsHiddenRole to ThemeModel for hidden themes

ThemeModel: Filter themes based on IsDlcRole rather than string-based

Online room: Display error image in preview when host selects a map you don't have

- Correct initialisation of TeamsGameOver (on mobile it doesn't get reset between plays, so ones set to true, prevents game to be finished next time)

Multiplayer page: Properly disable scheme/style/weapons widgets when changing style or mission map

Don't gray out images of disabled ToggleButtons as its a little too hard on the eyes The disabled state is visible by the button border color.

- New AppIcon (no more black background!)

- Migrate AppIcons to xcassets - Use universal launch screen instead of bunch of images

Fix crasher

- Missing languages

- Use two-letter language descriptor for localisations

Show sidNoEndTurn text for most weapons when in inf attack mode

Draw map page: Fix pen size being changed after loading a map

Fix speech bubble briefly rendering at (0,0) after spawning

Remove ugly empty rectangle in empty active teams list for real

Fix simple team hats (32×64) not tinting correctly while on rope or using blowtorch

Remove “Upload to YouTube” functionality which has been broken for years

Various minor frontend CSS tweaks - Static border color for stats, teams list, map draw widget - Explicit definition of table header - New splitter design which works with the Qt style “Windows”

QTfrontend: Remove ugly rectangle in list of active teams when there are no teams

- Hide 'Campaign' button (not ready on iOS...)

Frontend: Properly “gray out” most disabled widgets (a lot of them weren't)

Some padding tweaks in options and team editor pages. Fixes insane width of context menu of hog name line edit

Make video metadata strings translatable in frontend In the video page, a small part of the strings was untranslatable, e.g. “Player: ”. These were part of the video metadata. Now these are localizable.

- Fix archiving (?)

- Pause game when it goes background (do not show anymore annoying 'confirm quit')

- Do not delete Beach theme (it's official one now)

Drop Qt XML from dependencies. QXmlStreamReader is part of QtCore

Remove Qt SVG and Qt OpenGL as hard dependencies Qt SVG is not used in the frontend (no SVGs are rendered). Neither is Qt OpenGL used. Qt OpenGL is discouraged anyway.

Mutant: When game ends prematurely due to missing land, declare highest-scoring team the winner

Mutant: Fix graph title on game draw

Make chart in stats screen support negative numbers. Fixes e.g. Mutant